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Investments - Schedule of Industry Composition of Investment at Fair Value (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Schedule of Investments [Line Items]    
Total investments at fair value $ 2,449,272 $ 2,488,715
Percent of Total Net Assets 205.80% [1] 208.00% [2]
Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 1,095,308 $ 1,330,526
Jocassee Partners LLC | Investment, Excluding Short Term Investment, With Previous Commitment To Provide Financing    
Schedule of Investments [Line Items]    
Total investments at fair value 1,085,025 1,315,630
Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 33,422 $ 79,599
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   100.00%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 100.00% 100.00%
Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 100.00% 100.00%
Aerospace & Defense    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 132,498
Percent of Total Net Assets   11.10%
Aerospace & Defense | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 61,069 $ 82,200
Aerospace & Defense | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   5.30%
Aerospace & Defense | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 5.60% 6.30%
Automotive    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 80,828
Percent of Total Net Assets   6.70%
Automotive | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 11,236 $ 26,087
Automotive | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 2,746 $ 2,463
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   3.30%
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.00% 2.00%
Automotive | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 8.20% 3.10%
Banking, Finance, Insurance, & Real Estate    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 401,816
Percent of Total Net Assets   33.60%
Banking, Finance, Insurance, & Real Estate | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 115,269 $ 121,798
Banking, Finance, Insurance, & Real Estate | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 33 $ 254
Banking, Finance, Insurance, & Real Estate | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   16.10%
Banking, Finance, Insurance, & Real Estate | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 10.60% 9.30%
Banking, Finance, Insurance, & Real Estate | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.10% 0.30%
Beverage, Food, & Tobacco    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 23,135
Percent of Total Net Assets   1.90%
Beverage, Food, & Tobacco | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 28,657 $ 30,637
Beverage, Food, & Tobacco | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 3,578 $ 3,172
Beverage, Food, & Tobacco | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   0.90%
Beverage, Food, & Tobacco | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 2.60% 2.30%
Beverage, Food, & Tobacco | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 10.70% 4.00%
Capital Equipment    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 128,706
Percent of Total Net Assets   10.80%
Capital Equipment | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 13,376 $ 17,986
Capital Equipment | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 0 $ 5,271
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   5.20%
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.20% 1.40%
Capital Equipment | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.00% 6.60%
Chemicals, Plastics, & Rubber    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 35,897
Percent of Total Net Assets   3.00%
Chemicals, Plastics, & Rubber | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 30,248 $ 37,030
Chemicals, Plastics, & Rubber | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 2,954 $ 2,942
Chemicals, Plastics, & Rubber | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   1.50%
Chemicals, Plastics, & Rubber | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 2.80% 2.80%
Chemicals, Plastics, & Rubber | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 8.90% 3.70%
Construction & Building    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 30,387
Percent of Total Net Assets   2.50%
Construction & Building | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 21,805 $ 16,942
Construction & Building | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 0 $ 1,867
Construction & Building | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   1.20%
Construction & Building | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 2.00% 1.30%
Construction & Building | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.00% 2.40%
Consumer goods: Durable    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 47,074
Percent of Total Net Assets   3.90%
Consumer goods: Durable | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 26,531 $ 26,412
Consumer goods: Durable | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 232 $ 1,042
Consumer goods: Durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   1.90%
Consumer goods: Durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 2.50% 2.00%
Consumer goods: Durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.70% 1.30%
Consumer goods: Non-durable    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 28,210
Percent of Total Net Assets   2.40%
Consumer goods: Non-durable | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 21,629 $ 21,850
Consumer goods: Non-durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   1.10%
Consumer goods: Non-durable | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 2.00% 1.70%
Containers, Packaging, & Glass    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 37,524
Percent of Total Net Assets   3.10%
Containers, Packaging, & Glass | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 28,616 $ 26,829
Containers, Packaging, & Glass | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   1.50%
Containers, Packaging, & Glass | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 2.60% 2.00%
Energy: Electricity    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 20,874
Percent of Total Net Assets   1.70%
Energy: Electricity | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 10,005 $ 20,250
Energy: Electricity | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   0.80%
Energy: Electricity | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.90% 1.50%
Energy: Oil & Gas    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 3,240
Percent of Total Net Assets   0.30%
Energy: Oil & Gas | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 11,209 $ 6,724
Energy: Oil & Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   0.10%
Energy: Oil & Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.00% 0.50%
Environmental Industries    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 53,484
Percent of Total Net Assets   4.50%
Environmental Industries | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 6,237 $ 6,986
Environmental Industries | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 0 $ 3,487
Environmental Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   2.10%
Environmental Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.60% 0.50%
Environmental Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.00% 4.40%
Forest Products & Paper | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 1,156 $ 3,605
Forest Products & Paper | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.10% 0.30%
Healthcare & Pharmaceuticals | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 113,530 $ 141,070
Healthcare & Pharmaceuticals | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 3,821 $ 12,880
Healthcare & Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 10.50% 10.70%
Healthcare & Pharmaceuticals | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 11.40% 16.20%
High Tech Industries    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 303,082
Percent of Total Net Assets   25.40%
High Tech Industries | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 87,247 $ 174,572
High Tech Industries | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 9,363 $ 14,661
High Tech Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   12.20%
High Tech Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 8.00% 13.30%
High Tech Industries | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 28.00% 18.40%
Hotel, Gaming, & Leisure    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 54,256
Percent of Total Net Assets   4.50%
Hotel, Gaming, & Leisure | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 22,031 $ 22,834
Hotel, Gaming, & Leisure | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   2.20%
Hotel, Gaming, & Leisure | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 2.00% 1.70%
Investment Funds & Vehicles    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 110,066
Percent of Total Net Assets   9.20%
Investment Funds & Vehicles | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 20,427 $ 33,450
Investment Funds & Vehicles | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   4.40%
Investment Funds & Vehicles | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.90% 2.50%
Media: Advertising, Printing, & Publishing    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 39,447
Percent of Total Net Assets   3.30%
Media: Advertising, Printing, & Publishing | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 10,420 $ 12,081
Media: Advertising, Printing, & Publishing | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   1.60%
Media: Advertising, Printing, & Publishing | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.00% 0.90%
Media: Broadcasting & Subscription    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 13,277
Percent of Total Net Assets   1.10%
Media: Broadcasting & Subscription | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 17,297 $ 31,201
Media: Broadcasting & Subscription | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   0.50%
Media: Broadcasting & Subscription | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.60% 2.40%
Media: Diversified & Production    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 64,559
Percent of Total Net Assets   5.40%
Media: Diversified & Production | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 41,913 $ 41,182
Media: Diversified & Production | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   2.60%
Media: Diversified & Production | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 3.90% 3.10%
Metals & Mining    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 8,993
Percent of Total Net Assets   0.80%
Metals & Mining | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 4,028 $ 3,863
Metals & Mining | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   0.40%
Metals & Mining | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.40% 0.30%
Retail | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 12,361 $ 13,141
Retail | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 0 $ 6,255
Retail | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.10% 1.00%
Retail | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.00% 7.90%
Services: Business    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 326,762
Percent of Total Net Assets   27.30%
Services: Business | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 213,492 $ 215,819
Services: Business | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 4,411 $ 6,798
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   13.20%
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 19.70% 16.40%
Services: Business | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 13.20% 8.50%
Services: Consumer    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 61,409
Percent of Total Net Assets   5.10%
Services: Consumer | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 58,080 $ 58,632
Services: Consumer | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 0 $ 8,525
Services: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   2.50%
Services: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 5.40% 4.50%
Services: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.00% 10.70%
Structured Product    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 102,922
Percent of Total Net Assets   8.60%
Structured Product | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   4.10%
Telecommunications    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 27,565
Percent of Total Net Assets   2.30%
Telecommunications | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 36,205 $ 36,027
Telecommunications | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   1.10%
Telecommunications | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 3.30% 2.70%
Transportation: Cargo    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 96,450
Percent of Total Net Assets   8.10%
Transportation: Cargo | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 41,968 $ 57,575
Transportation: Cargo | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 6,284 $ 6,296
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   3.90%
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 3.90% 4.40%
Transportation: Cargo | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 18.80% 7.90%
Transportation: Consumer    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 11,951
Percent of Total Net Assets   1.00%
Transportation: Consumer | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 8,529 $ 12,613
Transportation: Consumer | Sierra JV    
Schedule of Investments [Line Items]    
Total investments at fair value $ 0 $ 3,686
Transportation: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   0.50%
Transportation: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.80% 1.00%
Transportation: Consumer | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Sierra JV    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.00% 4.60%
Utilities: Electric    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 22,696
Percent of Total Net Assets   1.90%
Utilities: Electric | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 10,454 $ 9,396
Utilities: Electric | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   0.90%
Utilities: Electric | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 1.00% 0.70%
Utilities: Oil & Gas    
Schedule of Investments [Line Items]    
Total investments at fair value   $ 4,655
Percent of Total Net Assets   0.40%
Utilities: Oil & Gas | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Total investments at fair value $ 0 $ 6,838
Utilities: Oil & Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member    
Schedule of Investments [Line Items]    
Percent of Total Portfolio   0.20%
Utilities: Oil & Gas | Percentage of Total Portfolio, at Fair Value | Industry Concentration Risk Member | Jocassee Partners LLC    
Schedule of Investments [Line Items]    
Percent of Total Portfolio 0.00% 0.50%
[1] Fair value as a percentage of net assets.
[2] Fair value as a percentage of net assets.